Spring-tread for stairways.



G. BUELLESBAGH.

SPRING TREAD FOR STAIBWAYS.

APPLICATION-FILED JULY 22, 1918.

1,105,877, Patented Aug.4,1914.

W @w/lwbz 5] wue ntoz 7.

wet-312m, 2%; hi

THE NORRIS PETERS CQ. PHOm-LITHQ. WASNINGIUN. D. C.

' 1; an. STATES arn'r FFTCE.

oAsPAR BUELLESBACH, .01 new YORK, N. Y.

SJPRING--TREAD FOR STAIRWAYS.

Specification of Letters Patent.

Application filed. July 22, 1913. Serial No. 780,613.

To all whom it may concern:

Be it: known that I, CASPAR BunLnnsBAoH, a citizen of the United States, residing at .New York, in the county of New York and State or New York, have invented certain new and useful Improvements in Spring- Treads for Stairways; and I do. hereby declare the following to be a full, clear, and exact description of the invention,.such as will enable other skilled in the art to which.

it appertains to make and use the same.

The present invention has relation toan.

improved form of spring tread to be applied to stairways for tenements and other public places, particularly, and the same is espe cially useful and valuable inthe eonstruction of fire-proof stairs.

A number of forms of spring tread have been proposed for i constructing stairways but all of these have disadvantages which the present invention is intended to overcome.

One of the advantages of theipresent in: vention is that,while it afiords a construction which canbe easily assembled, or taken it is so constructed as to prevent water and dirt from getting under the various parts and interferingwith the actionof the moving step or tread.

Another advantage of the invention is that it makes it possible easily to apply additional spring power where it is desirable for any reason to increase the weight of a given tread; and in general the construction covered by this invention has the advantages of flexibility of character, cheaplness and ease of construction and adaptabi ity to fire proof .work.

The invention is illustrated in: a preferred form in the accompanying drawings wherein- Figure 1 is a central vertical section of the stairway provided with my invention taken on the line 11 of Fig. 2 and Fig. 2 is a section of a part of Fig. 1 taken on the line 2.2 of Fig. 1, looking toward the left in Fig. l, therise-r guard plate being re slate, stone or other fire-proof material or theymaybe made of wood but this is not the preferred construction. These movable members are shown at 12 and each is hinged to the skeleton permanent stairway by means of a guard plate 13 attached by a hinge l4 and providedwith bent edges at each end as shown. The edge 15 depends from the front end of each movable tread and serves as a guard to prevent water or dirt from gettingunder the tread from the front. The bent edge 16 conforms to the rear end of the tread 12 and projects above it as clearly shown in the drawing, so as to overlap the edge of the riser guard plate 17.

PatentedAugx i, 1914;.-

Each riser is provided with a guard plate 17 which is preferably bolted to the skeleton frame work and is slightly inclined so as to leave enough space behind the lower edge to permit the play backward and forward of the upturned edge 16 when the step 12 is tilted around the edge 14;. that the edge 16 of each plate 13 cooperates with the riser guard plate to prevent dirt or water from getting in behind the step 12 in each instance. a

The front end of each step 12 is supported by a number of springs 18 which surround guide posts 19 fixed as shown to the underside of the step 12. The posts 19 pass through appropriate openings in the cross bracket 20 which is fixed to the skeleton frame work, and this bracket also supports the springs 18. A nut or head 21 on the lower end of each post 19 acts as a stop to prevent undue upward movement of the step 12 under the action of the supporting springs.

The advantage of this structure is that the springs can be maintained under con It will be seen springs are not so arranged they must either be so stiff as to give very poorresults, or they oiter insufficient resistance and the steps make a disagreeable noise when walked on.

It is obvious, that where it is desired to increase the weight of the step in a given construction, the number of springs may be increased, and this can be donevery easily without taking the structure apart more than by simply removing the guard plate 17 so as to have access to the cross bracket 20 in any instance. A hole can then be bored wherever desired in the bracket 20 and a small stud can be supplied as shown in Fig.

I riety of forms obvious to ,those skilled in ilO ' skeletonaside supports, a riser guard plate, a

2 at22. A spring oan then be inserted theart without departing from .the scope of the sa me and I do not; limit myself to" the detailsihereinshown vand desoribed.f l TVi hat Lolaim is-1 v 1.111 a stairway and in combination with,

hinged tread, a spring support for said tread and" a guard ..pl.ate. applied "to said" said riser guard plate, substantially as described.

said tread, and a guard plate appliedto said tread extending upward into the space behind said riser. guard "plate andlapping under the same, substantially as'desoribed.

in presence of two witnesses.

Witnesses: I

tread extending upward "so as to lap under Copies of ghi'patem may-he obtained we fiveicents KATHARINE C. ME D;

' 2; In a stairway and in combination with skeleton side supports, ariser guard plate inclined forward so as to leave a, space b e-- v hind'its lower edge, a spring supportifor;

each; by addrssing the ommissioner of; Patentm.

In "testimonywhereofll affix my signature,

S E BUELLESBACH'; 

